Sql Server Freetext通过实体框架

I have an existing website developped using ASP.NET MVC 3 and Entity Framework 4 querying an Sql Server 2008 database. It contains a search form with around 10 fields, and when the user clicks the submit button I dynamically create an Entity SQL request containing only the specified search fields, omitting the empty ones. It works. So far so good.I have an existing website developped using ASP